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Really? because in a game Im currently playing with a friend of mine, he and I in a team the AI isnt, they just all declared war on us in a couple of turns space.

To quote Henry Temple,

Therefore I say that it is a narrow policy to suppose that this country or that is to be marked out as the eternal ally or the perpetual enemy of England. We have no eternal allies, and we have no perpetual enemies. Our interests are eternal and perpetual, and those interests it is our duty to follow.

There's pretty much only a few reasons the AI will invade you, and they're all telegraphed on the diplomacy screen:

1) They envy your lands (because you expanded on what they planned to expand to)
2) They envy your relations (because you're allies with city-states they're near)
3) They have close borders with you (see 1)

Everything else is just an excuse to fix one of those three, which is probably why it may look schizophrenic. Good relations breed good relations, but politeness doesn't stop them from wanting to expand.

They invade, however, when they think they can get away with it, and judge this largely on how many of your military units they can see. Having a large standing army isn't necessary, but having a standing army on their border staring them in the face is more than enough to cow them into grumbling to themselves quietly.

Big stick diplomacy works in Civilization 5. You can actually get away with being a less-than-stellar neighbor if you just stack units near their borders whenever they start complaining. Likewise, open border agreements may be a tad risky as, while they foster good relations, they may also be the vanguard of an expeditionary force.

Last edited by Nalano; 11-07-2013 at 06:29 PM.

NalanoH. Wildmoon
Director of the Friends of Nalano PAC
Attorney at Lawl
"His lack of education is more than compensated for by his keenly developed moral bankruptcy." - Woody Allen

"Quantacat's name is still recognised even if he watches on with detached eyes like Peter Molyneux over a cube in 3D space, staring at it with tears in his eyes, softly whispering... Someday they'll get it." - The Conclave

In the off-chance that anyone else didn't even contemplate this possibility - there's a demo available on Steam. A demo!
(You play as Morocco for a bit. Right up until it starts to get at all tasty in my single experience.)

"Quantacat's name is still recognised even if he watches on with detached eyes like Peter Molyneux over a cube in 3D space, staring at it with tears in his eyes, softly whispering... Someday they'll get it." - The Conclave

"Quantacat's name is still recognised even if he watches on with detached eyes like Peter Molyneux over a cube in 3D space, staring at it with tears in his eyes, softly whispering... Someday they'll get it." - The Conclave

"Quantacat's name is still recognised even if he watches on with detached eyes like Peter Molyneux over a cube in 3D space, staring at it with tears in his eyes, softly whispering... Someday they'll get it." - The Conclave

"Quantacat's name is still recognised even if he watches on with detached eyes like Peter Molyneux over a cube in 3D space, staring at it with tears in his eyes, softly whispering... Someday they'll get it." - The Conclave

Just started a game with Assyria plus random map type. Looks like islands so far. The AI was especially terrible at naval warfare and didn't really push for the relevant technologies, even on island maps. Also, some of the new UAs look pretty overpowered at first glance (looking at you here, Poland, Venice, Soshone).